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Note 7 - Accounts Payable and Accrued Liabilities - Changes in Product Warranty Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Balance, beginning of period $ 96 $ 48
Warranty settlements (54) (9)
Warranty provision 12 19
Balance, end of period $ 54 $ 58